The average age of 10 students is 14 years. A new student joins, and the average becomes 14.5 years. The new student's age is:
A$19.5$ years
B$14.5$ years
C$15$ years
D$24$ years
Answer & Solution
Correct answer: A. $19.5$ years
Old total = 14 × 10 = 140. New total = 14.5 × 11 = 159.5. New student's age = 159.5 − 140 = 19.5.
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